Phoenix PD Ruger P-95 LEA scans
Email csafe@iastate.edu to obtain the data.
The data consist of
scans of bullet land engraved
areas in x3p format. The
study is structured so
that there are 8 barrels
(identified with an alphanumeric code, such as A9, C8, etc.) used to
fire the known bullets in the
study, with three bullets
known to be fired from
each barrel (Bullet1, Bullet2, Bullet3).
Each bullet contains 6
land engraved areas, which are
identified as Land 1-Land
6.
In addition to the 24
bullets with known provenance,
there are 8 "unknown"
bullets which can be matched
to the 8 barrels, for
a total of 32 bullets.
Each bullet has 6 land
engraved areas, for a total
of 192 scans. Unknown bullets are identified with a letter.
This study is an open study, that is, not all of the unknown bullets may match to the known barrels in the set. Some of the unknown bullets may have been fired from other types of Ruger handguns.
The x3p format provides for the inclusion of relevant metadata within the x3p file, including the machine used to scan the bullets, the operator, and the resolution of the scan. The total dataset size is about 3.4 GB.
Files are grouped
as follows: BarrelXX/BulletY/ with the land number identified as part of the filename.
Information on x3p format: https://www.iso.org/standard/62310.html
We have produced two R packages meant to work with this data:
- x3ptools (on CRAN, with dev versions on github at heike/x3ptools). x3ptools contains utilities for reading, writing, annotating, rendering, and exporting x3p data to other formats.
- bulletxtrctr (dev version on github at heike/bulletxtrctr). bulletxtrctr contains utilities for extracting useful data from bullet LEA scans as well as a matching algorithm used to match unknown bullets to the barrels they were fired from.
Scans were created by Bill Henderson at Sensofar. Tylor Klep of the Phoenix Police Department designed the study and collected the bullets.
